In something like Grid3D_Gas_Master_Emitter, look in the Emitter Update section for "Compensate For Actor Motion" and give it a blue check. So if you move the emitter source, it will act more like motion affected it.

There might be some influence of using "localspace" versus System as well -- I think that might be necessary if you put smoke or flame coming out of say a rocket. That's just updating the source of the output, and would not necessarily act like a flame thrower in a dynamic fashion without the Compensate for Actor Motion check.